SPOILERS
I mean cortana's demise on halo4. Is she really dead?. I know you guys have better understanding of the halo universe than me.
Do you tuhink she will ever comeback?
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I like the idea that was suggested in which H5 does see a replacement Cortana in an attempt to get Chief back in service. As he seems a little 'off' at the end in which he just stares out of the window. Except this new Cortana will be like the old Cortana mentioned that it'll look like her but it won't have the memories that bonded them. So you may get a mission with this new Cortana but she's cold, calculating and condescending. I imagine a scene playing out where Halsey is observing John whilst the new Cortana appears in front of him. After John realizes it isn't her. He simply walks away from the pedestal and leaves the room. After that they could either pair him with a brand new AI (please not Roland) or have a different pairing such as Lasky or Thel Vadam